Ludington, S., & Yeoman, R. A. (1980). Geologic map of the Hunter-Fryingpan Wilderness Area and the Porphyry Mountain Wilderness Study Area, Pitkin County, Colorado. The Survey.
Chicago Style (17th ed.) CitationLudington, Steve, and R. A. Yeoman. Geologic Map of the Hunter-Fryingpan Wilderness Area and the Porphyry Mountain Wilderness Study Area, Pitkin County, Colorado. Reston, Va.: The Survey, 1980.
MLA (9th ed.) CitationLudington, Steve, and R. A. Yeoman. Geologic Map of the Hunter-Fryingpan Wilderness Area and the Porphyry Mountain Wilderness Study Area, Pitkin County, Colorado. The Survey, 1980.
Warning: These citations may not always be 100% accurate.